John Marshall Conkin was born circa 1863, a son of James Conkin and his wife, Mary Steadman. John died July 11, 1923, in Kingsport, Sullivan county, Tennessee, at the age of 50. 
John was married twice. His first wife was Cleo Mullinex, born in June, 1867, in Hawkins, Tennessee, a daughter of Amos K. Mullenix and Elizabeth Dykes. Cleo had previously married Francis Marion Dykes (1862-1899) who died at the young age of 26 years. Cleo brought to the marriage her daughter Relda Mae, who was ten years old when her father died.
Children of John and Cleo include:
Charmie Devonia Conkin, born July 21, 1892, in Fall Branch, Sullivan county, Tennessee, died March 31, 1968, in Amelia Court House, Virginia, married Nathan Monroe Crawford
Charles Kendall Conkin, born August 27, 1895, in Kingsport, Sullivan county, Tennessee, died January 8, 1958, in Green City, Sullivan county, Missouri, married Elfa Edna Brees, in 1918
Onnie McKinley Conkin, born January 23, 1902, in Kingsport, Sullivan county, Tennessee.
Cleo died in 1904 around 36 years of age. John married, secondly, Hattie Boyer, born January 3, 1886. John and Hattie became the parents of at least two daughters:
Mary "Susie" Conkin, born August 7, 1915, died July 25, 1998
Reba Louis Conkin, born December 18, 1921, died October 19, 1981, married George Ray Steadman
John Marshall Conkin died July 11, 1923, at the age of sixty and is buried in the Lone Star Cemetery, in Sullivan county, Tennessee 
↑ "Tennessee Deaths, 1914-1966," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:NSQL-D83 : 26 August 2019), John M. Conkin, 11 Jul 1923; Death, Kingsport, Sullivan, Tennessee, United States, Tennessee State Library and Archives, Nashville
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It may be possible to confirm family relationships with James by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with James: